[Python] Why Python IDE shows such error even when it is installed correctly

1. It shows such as turtle.Terminator
2. AttributeError: module 'turtle' has no attribute 'forward'

>>> import turtle
>>> for i in range(50,100,10):
... for j in range(4):
... turtle.forward(i)
... turtle.left(90)
...
Traceback (most recent call last):
File "<stdin>", line 3, in <module>
File "<string>", line 5, in forward
turtle.Terminator


Note: my expected result is a square

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